/**
 * Copyright (C) 2007 The AsyncMail Group <asyncmail@googlegroups.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.asyncmail.smtp.filter;

import org.apache.commons.logging.Log;
import org.apache.mina.common.IoFilterAdapter;
import org.apache.mina.common.IoSession;
import org.springframework.beans.factory.annotation.Required;

import com.googlecode.asyncmail.smtp.SMTPRequest;
import com.googlecode.asyncmail.smtp.SMTPResponse;
import com.googlecode.asyncmail.smtp.SMTPResponseImpl;
import com.googlecode.asyncmail.smtp.SMTPRetCode;

public class AbstractValidationFilter extends IoFilterAdapter {

    private Log logger;

    @Required
    public void setLogger(Log logger) {
        this.logger = logger;
    }

    protected Log getLogger() {
        return logger;
    }

    @Override
    public void filterWrite(NextFilter arg0, IoSession arg1, WriteRequest arg2)
            throws Exception {
        Object obj = arg2.getMessage();

        if (obj instanceof SMTPResponse || obj instanceof SMTPRequest) {
            super.filterWrite(arg0, arg1, arg2);
        } else {
            logger.error("WriteRequest holds not a SMTPResponseImpl but "
                    + (obj == null ? "NULL" : obj.getClass()));
            arg0.filterWrite(arg1, new WriteRequest(new SMTPResponseImpl(
                    SMTPRetCode.TRANSACTION_FAILED, "Cannot handle Request")));
        }
    }
}
